Efficient launching of shear phonons in photostrictive halide perovskites

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dc.contributor.authorHoriachyi, Dmytro O.
dc.contributor.authorNestoklon, Mikhail O.
dc.contributor.authorAkimov, Ilya A.
dc.contributor.authorTrifonov, Artur V.
dc.contributor.authorSiverin, Nikita V.
dc.contributor.authorKopteva, Nataliia E.
dc.contributor.authorKosarev, Alexander N.
dc.contributor.authorYakovlev, Dmitri R.
dc.contributor.authorGusev, Vitalyi E.
dc.contributor.authorFries, Melina
dc.contributor.authorTrukhina, Olga
dc.contributor.authorDyakonov, Vladimir
dc.contributor.authorBayer, Manfred
dc.date.accessioned2025-12-03T12:34:08Z
dc.date.available2025-12-03T12:34:08Z
dc.date.issued2025-11-05
dc.description.abstractOptical generation of coherent transverse phonons by femtosecond light pulses is appealing for sub-terahertz high-speed active control of material properties. Lead-free double-perovskite semiconductors, such as Cs2AgBiBr6, attract particular interest in this respect due to their structural phase transition and strong carrier-lattice coupling. Here, we reveal that the giant anisotropic photostriction in halide perovskites with tetragonal crystal structure provides an efficient nonthermal tool for generating coherent transverse phonons. Using time-domain Brillouin spectroscopy, we observe transverse and longitudinal acoustic phonons with comparable amplitudes in the tetragonal phase of Cs2AgBiBr6 below the temperature of 122 kelvins, while, in the cubic phase, only longitudinal phonons are generated. The polarization of the transverse phonons is dictated by the projection of the crystal c axis on the surface plane, which leads to a prominent anisotropic polarization response in the detection. The generated strain pulses correspond to soft transverse acoustic eigenmodes with a strong temperature dependence of dispersion, providing an additional degree of freedom for hypersonic manipulation.en
dc.identifier.urihttp://hdl.handle.net/2003/44411
dc.language.isoen
dc.relation.ispartofseriesScience advances; 11(45)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc530
dc.titleEfficient launching of shear phonons in photostrictive halide perovskitesen
dc.typeText
dc.type.publicationtypeResearchArticle
dcterms.accessRightsopen access
eldorado.dnb.deposittrue
eldorado.doi.registerfalse
eldorado.secondarypublicationtrue
eldorado.secondarypublication.primarycitationDmytro O. Horiachyi et al., Efficient launching of shear phonons in photostrictive halide perovskites. Sci. Adv. 11, eadw9172 (2025). DOI: 10.1126/sciadv.adw9172
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1126/sciadv.adw9172

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